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Metal carbide catalyst, preparation method thereof and application thereof in lithium-oxygen battery

A metal carbide, lithium-oxygen battery technology, used in battery electrodes, fuel cell-type half-cells, primary battery-type half-cells, circuits, etc., to achieve the effects of low overpotential, excellent stability, and excellent rate capacity

Inactive Publication Date: 2020-11-10
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Mo 2 C has been hailed as a competitive bifunctional catalyst for hydrogen evolution reaction (HER), hydrocarbon conversion, and ORR / OER of LOBs, but Mo 2 C's long-term instability remains a big challenge

Method used

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  • Metal carbide catalyst, preparation method thereof and application thereof in lithium-oxygen battery
  • Metal carbide catalyst, preparation method thereof and application thereof in lithium-oxygen battery
  • Metal carbide catalyst, preparation method thereof and application thereof in lithium-oxygen battery

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Dissolve 0.5 g polyvinylpyrrolidone (PVP) and 0.5 g polyacrylonitrile (PAN, MW = 150000) in 10 ml N,N-dimethylformamide (DMF), then add 1.0 mmol ammonium molybdate (H 8 MON 2 o 4 ), stirred to obtain the electrospinning precursor solution; the prepared precursor solution was sucked into a plastic syringe (10ml) with a stainless steel nozzle (inner diameter of 0.4 mm) for electrospinning, during the electrospinning preparation process, the needle A high voltage of 12-15 kV was applied between the tip and the aluminum foil collector, while the distance between the tip and the receiver was controlled to be 10 cm, and the injection speed of the syringe was 0.05 mm min -1 After spinning, the obtained fabric was taken out from the collector and transferred to a vacuum oven maintained at 60 °C for 12 h, then the dried spun fabric was stably calcined in air at 200 °C for 1 h, and then In high purity N 2 Calcined at a high temperature of 800 °C for 2 h in a tube furnace used ...

Embodiment 2

[0024] Type 2032 LOBs were routinely assembled to evaluate catalyst activity after glow discharge plasma treatment. The electrocatalyst (GDP-Mo2C@NCF) of Example 1, carbon black (super P) and polyvinylidene fluoride binder were mixed in a weight ratio of 70:20:10, and then coated on carbon paper to prepare a conventional working electrode. Among them, the electrocatalyst loading on carbon paper is 0.6-0.8 mg / cm2; the electrolyte is 1M lithium bis(carbon trioxide) sulfonimide (LiTFSI), in dimethyl sulfoxide; 2032 type battery LOBs, including lithium Metal anode (15 mm diameter), glass fiber separator (gfc, 19 mm diameter) immersed in electrolyte, and cathode (working electrode, 14 mm diameter), were assembled in a glove box with high-purity argon.

[0025] The electrochemical performance of the assembled battery was routinely tested in a high-purity oxygen airtight container, the constant current discharge and charge test was carried out on the LAND BT 2000 battery test system,...

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Abstract

The invention belongs to the technical field of organic system lithium-oxygen batteries, and particularly discloses a metal carbide catalyst, a preparation method thereof and application of the metalcarbide catalyst in a lithium-oxygen battery. The method comprises the steps: preparing nitrogen-doped carbon nanofibers (Mo2C@NCF) doped with molybdenum carbide quantum dots through electrostatic spinning, and treating the surface of the catalyst through a glow discharge plasma (GDP) technology, so a Mo2C surface passivation layer (MoOx) of the catalyst can be damaged, and MoN compound bonds areintroduced. The lithium-oxygen battery positive electrode catalyst disclosed by the invention has the advantages that the coating of a passivation layer on the surface of the catalyst is destroyed, and more active sites are exposed; the interaction between ions is enhanced, and the performance of the catalyst is improved; the overpotential is remarkably reduced, the rate capability is excellent, and the cycling stability is greatly improved. According to the invention, the surface chemical property of the electrode material of the lithium-oxygen battery is optimized mainly through a simple glow discharge plasma process, and a promising way is opened up for improving the electrochemical performance of the electrode material.

Description

technical field [0001] The invention belongs to the technical field of organic lithium-oxygen batteries, and specifically discloses a metal carbide Mo 2 Preparation of C catalyst and its application in lithium oxygen battery. Background technique [0002] Due to its extremely high theoretical energy density (about 3500 Wh kg -1 ), lithium-oxygen batteries (LOBs) are receiving increasing attention as the most promising energy storage system for the next generation. However, their poor charge-discharge cycle durability and high polarization potential severely hinder their practical applications, mainly due to the relatively slow kinetics of the cathode, which include the oxygen reduction reaction (ORR) during discharge and charge Oxygen evolution reaction (OER) during the process, insoluble discharge products in the oxygen electrode (for example, non-conductive Li 2 o 2 ) excessive accumulation, etc. Proper oxygen electrode architecture design and the development of effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M4/96H01M12/06
CPCH01M4/8668H01M4/90H01M4/96H01M12/06
Inventor 杨瑞枝孙志辉金超
Owner SUZHOU UNIV
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